In the case of Darrell Manwyler, what was a key indicator of potential fraud?

The indication that his employer couldn't be contacted serves as a significant red flag for potential fraud. In situations involving workplace injuries, having the ability to verify employment details is crucial. If an employer cannot be reached, it raises suspicions about the legitimacy of the reported injury and the person's association with the company. This scenario can imply that the individual may have fabricated the employment or the circumstances of the injury to commit insurance fraud.

The other options, while they could suggest issues, do not directly relate to the verification of the injury claim in the same manner. For example, the legitimacy of the employer or the living situation may not have a direct impact on the validity of an injury claim unless they are linked to the employment context, which is uncertain in those cases.